feat: openid login

pkg/wechat/auth/token.go

@@ -0,0 +1,45 @@
+package auth
+
+import (
+	"fmt"
+
+	"lone-services/pkg/utils"
+
+	jsoniter "github.com/json-iterator/go"
+)
+
+const accessTokenURL = "https://api.weixin.qq.com/cgi-bin/token"
+
+type AccessTokenResult struct {
+	AccessToken string `json:"access_token"`
+	ExpiresIn   int    `json:"expires_in"`
+	ErrCode     int    `json:"errcode"`
+	ErrMsg      string `json:"errmsg"`
+}
+
+func (c *Client) AccessToken() (*AccessTokenResult, error) {
+	if c == nil || c.AppID == utils.StringEmpty || c.Secret == utils.StringEmpty {
+		return nil, fmt.Errorf("wechat app config missing")
+	}
+
+	body, err := utils.Curl(accessTokenURL).SetData(map[string]string{
+		"grant_type": "client_credential",
+		"appid":      c.AppID,
+		"secret":     c.Secret,
+	}).Get("")
+	if err != nil {
+		return nil, err
+	}
+
+	var result AccessTokenResult
+	if err := jsoniter.UnmarshalFromString(body, &result); err != nil {
+		return nil, err
+	}
+	if result.ErrCode != utils.NumberZero {
+		return nil, fmt.Errorf("wechat access_token: %d %s", result.ErrCode, result.ErrMsg)
+	}
+	if result.AccessToken == utils.StringEmpty {
+		return nil, fmt.Errorf("wechat access_token empty")
+	}
+	return &result, nil
+}